print/mod_ipp/mod_ipp.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright 2015 Nexenta Systems, Inc.  All rights reserved.
 */

/* $Id: mod_ipp.c 149 2006-04-25 16:55:01Z njacobs $ */

/*
 * Internet Printing Protocol (IPP) module for Apache.
 */

#include "ap_config.h"

#include <stdio.h>
#include <unistd.h>
#include <time.h>
#include <sys/time.h>
#include <values.h>
#include <libintl.h>
#include <alloca.h>

#include "httpd.h"
#include "http_config.h"
#include "http_core.h"
#include "http_protocol.h"
#include "http_log.h"
#include "http_main.h"
#ifndef APACHE2
#include "apr_compat.h"
#define apr_table_get ap_table_get
#endif  /* APACHE2 */

#include "papi.h"

#include <papi.h>
#include <ipp-listener.h>

#ifndef APACHE2
module MODULE_VAR_EXPORT ipp_module;
#else
module AP_MODULE_DECLARE_DATA ipp_module;
#endif

#ifndef AP_INIT_TAKE1   /* Apache 2.X has this, but 1.3.X does not */
#define AP_INIT_NO_ARGS(directive, action, arg, where, mesg) \
    { directive, action, arg, where, NO_ARGS, mesg }
#define AP_INIT_TAKE1(directive, action, arg, where, mesg) \
    { directive, action, arg, where, TAKE1, mesg }
#define AP_INIT_TAKE2(directive, action, arg, where, mesg) \
    { directive, action, arg, where, TAKE2, mesg }
#endif

typedef struct {
    int conformance;
    char *default_user;
    char *default_svc;
    papi_attribute_t **operations;
} IPPListenerConfig;

#ifdef DEBUG
void
dump_buffer(FILE *fp, char *tag, char *buffer, int bytes)
{
    int i, j, ch;

    fprintf(fp, "%s %d(0x%x) bytes\n", (tag ? tag : ""), bytes, bytes);
    for (i = 0; i < bytes; i += 16) {
        fprintf(fp, "%s   ", (tag ? tag : ""));

        for (j = 0; j < 16 && (i + j) < bytes; j ++)
            fprintf(fp, " %02X", buffer[i + j] & 255);

        while (j < 16) {
            fprintf(fp, "   ");
            j++;
        }

        fprintf(fp, "    ");
        for (j = 0; j < 16 && (i + j) < bytes; j ++) {
            ch = buffer[i + j] & 255;
            if (ch < ' ' || ch == 127)
                ch = '.';
            putc(ch, fp);
        }
        putc('\n', fp);
    }
    fflush(fp);
}
#endif

static ssize_t
read_data(void *fd, void *buf, size_t siz)
{
    ssize_t len_read;
    request_rec *ap_r = (request_rec *)fd;

    len_read = ap_get_client_block(ap_r, buf, siz);
#ifndef APACHE2
    ap_reset_timeout(ap_r);
#endif

#ifdef DEBUG
    fprintf(stderr, "read_data(0x%8.8x, 0x%8.8x, %d): %d",
        fd, buf, siz, len_read);
    if (len_read < 0)
        fprintf(stderr, ": %s", strerror(errno));
    putc('\n', stderr);
    dump_buffer(stderr, "read_data:", buf, len_read);
#endif

    return (len_read);
}

static ssize_t
write_data(void *fd, void *buf, size_t siz)
{
    ssize_t len_written;
    request_rec *ap_r = (request_rec *)fd;

#ifndef APACHE2
    ap_reset_timeout(ap_r);
#endif
#ifdef DEBUG
    dump_buffer(stderr, "write_data:", buf, siz);
#endif
    len_written = ap_rwrite(buf, siz, ap_r);

    return (len_written);
}

static void
discard_data(request_rec *r)
{
#ifdef APACHE2
    (void) ap_discard_request_body(r);
#else
    /*
     * This is taken from ap_discard_request_body().  The reason we can't
     * just use it in Apache 1.3 is that it does various timeout things we
     * don't want it to do.  Apache 2.0 doesn't do that, so we can safely
     * use the normal function.
     */
    if (r->read_chunked || r->remaining > 0) {
        char dumpbuf[HUGE_STRING_LEN];
        int i;

        do {
            i = ap_get_client_block(r, dumpbuf, HUGE_STRING_LEN);
#ifdef DEBUG
            dump_buffer(stderr, "discarded", dumpbuf, i);
#endif
        } while (i > 0);
    }
#endif
}

void _log_rerror(const char *file, int line, int level, request_rec *r,
    const char *fmt, ...)
{
    va_list args;
    size_t size;
    char *message = alloca(BUFSIZ);

    va_start(args, fmt);
    /*
     * fill in the message.  If the buffer is too small, allocate
     * one that is large enough and fill it in.
     */
    if ((size = vsnprintf(message, BUFSIZ, fmt, args)) >= BUFSIZ)
        if ((message = alloca(size)) != NULL)
            vsnprintf(message, size, fmt, args);
    va_end(args);

#ifdef APACHE2
    ap_log_rerror(file, line, level, APR_SUCCESS, r, message);
#else
    ap_log_rerror(file, line, level, r, message);
#endif
}

static int
ipp_handler(request_rec *r)
{
    papi_attribute_t **request = NULL, **response = NULL;
    IPPListenerConfig *config;
    papi_status_t status;
    const char *s;
    int sockfd = -1;
    int ret;

    /* Really, IPP is all POST requests */
    if (r->method_number != M_POST)
        return (DECLINED);

    /*
     * An IPP request must have a MIME type of "application/ipp"
     * (RFC-2910, Section 4, page 19).  If it doesn't match this
     * MIME type, we should decline the request and let someone else
     * try and handle it.
     */
    if (r->headers_in == NULL)
        return (DECLINED);
    s = apr_table_get(r->headers_in, "Content-Type");
    if ((s == NULL) || (strcasecmp(s, "application/ipp") != 0))
        return (DECLINED);

    /* CHUNKED_DECHUNK might not work right for IPP? */
    if ((ret = ap_setup_client_block(r, REQUEST_CHUNKED_DECHUNK)) != OK)
        return (ret);

    if (!ap_should_client_block(r))
        return (HTTP_INTERNAL_SERVER_ERROR);

#ifndef APACHE2
    ap_soft_timeout("ipp_module: read/reply request ", r);
#endif
    /* read the IPP request off the network */
    status = ipp_read_message(read_data, r, &request, IPP_TYPE_REQUEST);

    if (status != PAPI_OK)
        _log_rerror(APLOG_MARK, APLOG_ERR, r,
            "read failed: %s\n", papiStatusString(status));
#ifdef DEBUG
    papiAttributeListPrint(stderr, request, "request (%d)  ", getpid());
#endif

#ifdef APACHE2
    s = ap_get_remote_host(r->connection, r->per_dir_config,
        REMOTE_NAME, NULL);
#else
    s = ap_get_remote_host(r->connection, r->per_dir_config,
        REMOTE_NAME);
#endif
    (void) papiAttributeListAddString(&request, PAPI_ATTR_EXCL,
        "originating-host", (char *)s);

    (void) papiAttributeListAddInteger(&request, PAPI_ATTR_EXCL,
        "uri-port", ap_get_server_port(r));

    if (r->headers_in != NULL) {
        char *host = (char *)apr_table_get(r->headers_in, "Host");

        if ((host == NULL) || (host[0] == '\0'))
            host = (char *)ap_get_server_name(r);

        (void) papiAttributeListAddString(&request, PAPI_ATTR_EXCL,
            "uri-host", host);
    }
    (void) papiAttributeListAddString(&request, PAPI_ATTR_EXCL,
        "uri-path", r->uri);

    config = ap_get_module_config(r->per_dir_config, &ipp_module);
    if (config != NULL) {
        (void) papiAttributeListAddInteger(&request, PAPI_ATTR_EXCL,
            "conformance", config->conformance);
        (void) papiAttributeListAddCollection(&request, PAPI_ATTR_EXCL,
            "operations", config->operations);
        if (config->default_user != NULL)
            (void) papiAttributeListAddString(&request,
                PAPI_ATTR_EXCL, "default-user",
                config->default_user);
        if (config->default_svc != NULL)
            (void) papiAttributeListAddString(&request,
                PAPI_ATTR_EXCL, "default-service",
                config->default_svc);
    }

    /*
     * For Trusted Solaris, pass the fd number of the socket connection
     * to the backend so the it can be forwarded to the backend print
     * service to retrieve the sensativity label off of a multi-level
     * port.
     */
#ifdef  APACHE2
    /*
     * In Apache 2.4 and later, could use: ap_get_conn_socket()
     * Apache 2.2 uses ap_get_module_config() but that needs
     * &core_module, for .module_index (which is just zero).
     * Could either inline that with index zero, or declare
     * core_module here.  Latter seems less evil.
     */
    {
        extern module core_module;
        apr_socket_t *csd = ap_get_module_config(
            r->connection->conn_config, &core_module);
        if (csd != NULL)
            (void) apr_os_sock_get(&sockfd, csd);
    }
#else
    sockfd = ap_bfileno(r->connection->client, B_RD);
#endif
    if (sockfd != -1) {
        (void) papiAttributeListAddInteger(&request,
            PAPI_ATTR_EXCL, "peer-socket", sockfd);
    }

    /* process the request */
    status = ipp_process_request(request, &response, read_data, r);
    if (status != PAPI_OK) {
        errno = 0;
        _log_rerror(APLOG_MARK, APLOG_ERR, r,
            "request failed: %s\n", papiStatusString(status));
        discard_data(r);
    }
#ifdef DEBUG
    fprintf(stderr, "processing result: %s\n", papiStatusString(status));
    papiAttributeListPrint(stderr, response, "response (%d)  ", getpid());
#endif

    /*
     * If the client is using chunking and we have not yet received the
     * final "0" sized chunk, we need to discard any data that may
     * remain in the post request.
     */
    if ((r->read_chunked != 0) &&
        (apr_table_get(r->headers_in, "Content-Length") == NULL))
        discard_data(r);

    /* write an IPP response back to the network */
    r->content_type = "application/ipp";

#ifndef APACHE2
    ap_send_http_header(r);
#endif

    status = ipp_write_message(write_data, r, response);
    if (status != PAPI_OK)
        _log_rerror(APLOG_MARK, APLOG_ERR, r,
            "write failed: %s\n", papiStatusString(status));
#ifdef DEBUG
    fprintf(stderr, "write result: %s\n", papiStatusString(status));
    fflush(stderr);
#endif

    papiAttributeListFree(request);
    papiAttributeListFree(response);

#ifndef APACHE2
    ap_kill_timeout(r);
    if (ap_rflush(r) < 0)
        _log_rerror(APLOG_MARK, APLOG_ERR, r,
            "flush failed, response may not have been sent");
#endif

    return (OK);
}


/*ARGSUSED1*/
static void *
create_ipp_dir_config(
#ifndef APACHE2
    pool *p,
#else
    apr_pool_t *p,
#endif
    char *dirspec)
{
    IPPListenerConfig *config;
#ifndef APACHE2
    config = ap_pcalloc(p, sizeof (*config));
#else
    config = apr_pcalloc(p, sizeof (*config));
#endif

    if (config != NULL) {
        (void) memset(config, 0, sizeof (*config));
        config->conformance = IPP_PARSE_CONFORMANCE_RASH;
        config->default_user = NULL;
        config->default_svc = NULL;
        (void) ipp_configure_operation(&config->operations,
            "required", "enable");
    }

    return (config);
}

/*ARGSUSED0*/
static const char *
ipp_conformance(cmd_parms *cmd, void *cfg, const char *arg)
{
    IPPListenerConfig *config = (IPPListenerConfig *)cfg;

    if (strncasecmp(arg, "automatic", 4) == 0) {
        config->conformance = IPP_PARSE_CONFORMANCE_RASH;
    } else if (strcasecmp(arg, "1.0") == 0) {
        config->conformance = IPP_PARSE_CONFORMANCE_LOOSE;
    } else if (strcasecmp(arg, "1.1") == 0) {
        config->conformance = IPP_PARSE_CONFORMANCE_STRICT;
    } else {
        return ("unknown conformance, try (automatic/1.0/1.1)");
    }

    return (NULL);
}

/*ARGSUSED0*/
static const char *
ipp_operation(cmd_parms *cmd, void *cfg, const char *op, const char *toggle)
{
    IPPListenerConfig *config = (IPPListenerConfig *)cfg;
    papi_status_t status;

    status = ipp_configure_operation(&config->operations,
        (char *)op, (char *)toggle);
    switch (status) {
    case PAPI_OK:
        return (NULL);
    case PAPI_BAD_ARGUMENT:
        return (gettext("internal error (invalid argument)"));
    default:
        return (papiStatusString(status));
    }

    /* NOTREACHED */
    /* return (gettext("contact your software vendor")); */
}

static const char *
ipp_default_user(cmd_parms *cmd, void *cfg, const char *arg)
{
    IPPListenerConfig *config = (IPPListenerConfig *)cfg;

    config->default_user = (char *)arg;

    return (NULL);
}

static const char *
ipp_default_svc(cmd_parms *cmd, void *cfg, const char *arg)
{
    IPPListenerConfig *config = (IPPListenerConfig *)cfg;

    config->default_svc = (char *)arg;

    return (NULL);
}

#ifdef DEBUG
/*ARGSUSED0*/
volatile int ipp_module_hang_sleeping = 1;
static const char *
ipp_module_hang(cmd_parms *cmd, void *cfg)
{

    /*
     * Wait so we can attach with a debugger.  Once attached,
     * assign ipp_module_hang_sleeping = 0 and step through.
     */
    while (ipp_module_hang_sleeping)
        sleep(1);

    return (NULL);
}
#endif /* DEBUG */

static const command_rec ipp_cmds[] =
{
    AP_INIT_TAKE1("ipp-conformance", ipp_conformance, NULL, ACCESS_CONF,
        "IPP protocol conformance (loose/strict)"),
    AP_INIT_TAKE2("ipp-operation", ipp_operation, NULL, ACCESS_CONF,
        "IPP protocol operations to enable/disable)"),
    AP_INIT_TAKE1("ipp-default-user", ipp_default_user, NULL, ACCESS_CONF,
        "default user for various operations"),
    AP_INIT_TAKE1("ipp-default-service", ipp_default_svc, NULL, ACCESS_CONF,
        "default service for various operations"),
#ifdef DEBUG
    AP_INIT_NO_ARGS("ipp-module-hang", ipp_module_hang, NULL, ACCESS_CONF,
        "hang the module until we can attach a debugger (no args)"),
#endif
    { NULL }
};

#ifdef APACHE2
/*ARGSUSED0*/
static const char *
ipp_scheme(const request_rec *r)
{
    return ("ipp");
}

/*ARGSUSED0*/
static unsigned short
ipp_port(const request_rec *r)
{
    return (631);
}

/* Dispatch list for API hooks */
/*ARGSUSED0*/
static void
ipp_register_hooks(apr_pool_t *p)
{
    static const char * const modules[] = { "mod_dir.c", NULL };

    /* Need to make sure we don't get directory listings by accident */
    ap_hook_handler(ipp_handler, NULL, modules, APR_HOOK_MIDDLE);
    ap_hook_default_port(ipp_port, NULL, NULL, APR_HOOK_MIDDLE);
    ap_hook_http_scheme(ipp_scheme, NULL, NULL, APR_HOOK_MIDDLE);
}

module AP_MODULE_DECLARE_DATA ipp_module = {
    STANDARD20_MODULE_STUFF,
    create_ipp_dir_config,      /* create per-dir    config */
    NULL,               /* merge  per-dir    config */
    NULL,               /* create per-server config */
    NULL,               /* merge  per-server config */
    ipp_cmds,           /* table of config commands */
    ipp_register_hooks      /* register hooks       */
};

#else   /* Apache 1.X */

/* Dispatch list of content handlers */
static const handler_rec ipp_handlers[] = {
    /*
     * This handler association causes all IPP request with the
     * correct MIME type to call the protocol handler.
     */
    { "application/ipp", ipp_handler },
    /*
     * This hander association is causes everything to go through the IPP
     * protocol request handler.  This is necessary because client POST
     * request may be for something outside of the normal printer-uri
     * space.
     */
    { "*/*", ipp_handler },

    { NULL, NULL }
};


module MODULE_VAR_EXPORT ipp_module = {
    STANDARD_MODULE_STUFF,
    NULL,           /* module initializer           */
    create_ipp_dir_config,  /* create per-dir    config structures  */
    NULL,           /* merge  per-dir    config structures  */
    NULL,           /* create per-server config structures  */
    NULL,           /* merge  per-server config structures  */
    ipp_cmds,       /* table of config file commands    */
    ipp_handlers,       /* [#8] MIME-typed-dispatched handlers  */
    NULL,           /* [#1] URI to filename translation */
    NULL,           /* [#4] validate user id from request   */
    NULL,           /* [#5] check if the user is ok _here_  */
    NULL,           /* [#3] check access by host address    */
    NULL,           /* [#6] determine MIME type     */
    NULL,           /* [#7] pre-run fixups          */
    NULL,           /* [#9] log a transaction       */
    NULL,           /* [#2] header parser           */
    NULL,           /* child_init               */
    NULL,           /* child_exit               */
    NULL            /* [#0] post read-request       */
};
#endif